Finding the Fourth Proportional to 81,920.13, 113,042.57 and 45,618.83

Step by Step Solution

1. Step 1: Write the proportion equation
   81,920.13 : 113,042.57 = 45,618.83 : x
2. Step 2: Convert to fraction form
   81,920.13/113,042.57 = 45,618.83/x
3. Step 3: Cross multiply
   81,920.13x = 113,042.57 × 45,618.83
4. Step 4: Simplify right side
   81,920.13x = 5,156,869,783.59
5. Step 5: Solve for x
   x = 5,156,869,783.59/81,920.13
6. Step 6: Final answer
   x = 62,949.97